Aquila's Head

This is the second to last bulletin board quest in New Ashos for the Thieves' Guild. Aquilla is holed up near the New Ashos Outskirts teleporter with a ton of human guards, most of which are pretty tough. The first four on the road are all archers, and each has a frankly ridiculous amount of HP; it's a good idea to assassinate at least one, then lure the rest down the road a ways so you can whittle them down with bombs, arrows, or summoned monsters.

Aquila himself is an unremarkable swordsman. Kill him, and loot his body for some cash, a new book, and an axe called Lightning Blast with a Shock Dmg +50 crystal already installed. Your reward from the Guild includes 200 auras, two lockpicks, and an Invisibility Brim, a hat with a Sneak +2 crystal in it.